Jefferson, PA 17329 Frost Dates
Jefferson, PA: when does the frost end?
Around 04/19 is the usual last spring frost, about 234 days away. Fall's first freeze usually shows up around 10/25, roughly 188 days after the last spring frost.
Zone 7a (0 to 5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Jefferson, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Jefferson's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Jefferson's last frost
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/08 and only about 1 year in 10 sees frost after that.
Jefferson against the rest of the dataset
At roughly 188 frost-free days, Jefferson places 22,142 of 40,283 ZIP codes in this dataset. Within PA, it ranks 595 of 2,088.
Learn more
Before leaning on 17329's figures: the frost range explains how to read the range around Jefferson's dates instead of trusting one, while local microclimates explains what one yard in Jefferson can differ from the 17329 normal.